342 results about "Silver colloid" patented technology

The present invention relates to an assay including a surface having silver colloids or islands attached thereto. Attached to the surface and/or silver colloids/islands are polynucleotides which are complimentary to a target polynucleotide sequence. The assay is performed by adding the target polynucleotide sequence to the assay surface and allowed to hybridize with the capture polynucleotides. Fluorophore-labeled capture polynucleotides are added and hybridize to the target polynucleotide. Bound target polynucleotides are detected by metal enhanced fluorescence.

The invention discloses a method for preparing antibacterial nanometer silver colloid, belonging to the technical field of nanometer biological materials. The method uses a chemical reduction method, comprising the following steps: dissolving water-soluble protective agent in silver nitrate water solution with the concentration of 0.001-0.1mol/L, wherein the mass ratio of protective agent to silver nitrate is 0.5-10.0:1; carrying out ice bath on sodium borohydride water solution with the concentration of 0.001-0.2mol/L for 10-30min; and dropwise adding the silver nitrate water solution containing protective agent in the sodium borohydride water solution with the speed of 30-60 drop/min, stirring by a magnetic stirrer, stirring for 20-40min after dropwise adding to prepare the nanometer silver colloid with the grain size of 5-80nm, wherein the mol ratio of the sodium borohydride to the silver nitrate is 1.0-30.0:1. The nanometer silver colloid prepared by the invention has the advantages of high concentration, high stability, high dispensability, and obviously-enhanced antibacterial property.

A thermal interface material (40) includes a silver colloid base (32), and an array of carbon nanotubes (22) disposed in the silver colloid base uniformly. The silver colloid base includes silver particles, boron nitride particles and polysynthetic oils. The silver colloid base has a first surface (42), and a second surface (44) opposite to the first surface. The carbon nanotubes are substantially parallel to each other, and extend from the first surface to the second surface. A method for manufacturing the thermal interface material includes the steps of: (a) forming an array of carbon nanotubes on a substrate; (b) immersing the carbon nanotubes in a silver colloid base; (c) solidifying the silver colloid base; and (d) peeling the solidified silver colloid base with the carbon nanotubes secured therein off from the substrate.

The invention discloses a method for preparing a nanometer silver colloid aqueous solution by adopting sodium carboxymethyl cellulose. The method comprises the following steps: a silver nitrate solid is dissolved in deionized water so as to prepare a silver nitrate aqueous solution A; sodium carboxymethyl cellulose is dissolved in deionized water so as to prepare a solution B; the solution A and the solution B are mixed, wherein the concentration of silver nitrate is 5*10<-5>-2.5*10<-2> mol/l, and the concentration of the sodium carboxymethyl cellulose is 0.2 to 25 g/l; the pH value of the solutions is controlled between 7 and 11; and the solutions react for 2 to 20 hours at a temperature between 15 and 90 DEG C, so as to obtain the aqueous solution containing silver colloid particles with the average particle size less than 100 nanometers. The nanometer silver colloid aqueous solution obtained by the method is brownish-grey at high concentration and is transparent bright yellow after dilution. The prepared nanometer silver colloid particles are stable in shape, good in dispersibility, adjustable and controllable in particle size distribution. The method has the advantages that the method adopts a common reaction vessel for reaction, and is simple in process, little in equipment investment and easy to implement, and raw materials involved in the reaction are friendly to environment, free from pollution, few in product impurities and convenient for post-treatment.

The invention relates to the field of semiconductor electronic materials, and in particular relates to a silver nanowire doped conductive silver colloid and a preparation method thereof. The raw materials of the silver nanowire doped conductive silver colloid provided by the invention comprise the following components in percentage by weight: 25-60% of micrometer silver powder, 5-30% of silver nanowires, 20-50% of epoxy resin, 1.6-4% of curing agent, 5.8-9.2% of dissolvent, 0.4-1.6% of accelerant, 0.04-0.16% of toughening agent and 0.8-2.4% of additive. The conductive silver colloid is prepared by mixing and doping single-crystal silver nanowires and silver granules, thus, the total silver doping amount is reduced to 35-45%, and the conductive silver colloid has a favorable conductive effect, high shear strength, low working temperature and good ageing-resistant performance, and the cost of the conductive silver colloid is reduced. The silver nanowire doped conductive silver colloid can be widely applied to the fields of solar cell (film, crystal silicon) conductive colloids, conductive colloid LED (Light-Emitting Diode) package and the like.

The invention discloses a 3D printing manufacturing method for a tantalum-coated hierarchical pore polyether-ether-ketone artificial bone scaffold. The method comprises the steps of scanning bone tissues of a human injured part through CT (computed tomography) to ensure that the tissue structure of symmetrical parts can be scanned at the bone tissues of the deficient part, acquiring injured bone image data, importing the data into Mimics software, and establishing a three-dimensional bone model of a human specified part; controlling the software through a 3D printing system to generate a motion locus code; printing a polyether-ether-ketone artificial bone scaffold by using the 3D printing system till the manufacturing process of the whole artificial bone scaffold is completed, putting the dried artificial bone scaffold into the cavity of a sputtering chamber of a magnetron sputtering instrument, bonding the artificial bone scaffold to an objective table by using silver colloid, and plating a tantalum coating on the artificial bone scaffold by adopting a magnetron sputtering technology; discharging gas from the sputtering chamber after the tantalum coating is plated, taking the artificial bone scaffold out, and disinfecting the tantalum-coated hierarchical pore polyether-ether-ketone scaffold to complete all the steps. The artificial bone scaffold is manufactured through 3D printing, so that the method disclosed by the invention has the advantage that the manufactured scaffold is harmless to the human body.

The invention relates to an efficient antibacterial antiviral treating agent, a preparation method and an application thereof. The antibacterial antiviral treating agent comprises a nanometer silver colloid, an organic anti-bacterial agent, a cosolvent, a polymer binder and water. According to the antibacterial antiviral treating agent, the use security is high, the quick-acting antibacterial rate of processed medical masks can reach to above 99%, the quick-acting killing effect on H1N1 influenza a virus and H5N1 avian influenza virus is excellent, and the antibacterial antiviral treating agent is non-toxic and harmless to skin and has an excellent long lasting effect.

The invention provides an ink composition comprising a silver colloid and an antitarnish agent for preventing discoloration of silver. Despite the use of a silver colloid which is likely to discolor, as a colorant, discoloration of the printing face in a relatively short period can be prevented, and good metal gloss of the printing face can be maintained over a longer period of time than that attained by the prior art technique.

The invention discloses a preparation method of functional fiber, particularly relates to an antibacterial cellulosic fiber or antibacterial cellulosic fiber product and a preparation method thereof, and belongs to the technical field of after-trimming of textiles. According to the antibacterial cellulosic fiber or antibacterial cellulosic fiber product and the preparation method thereof, a soluble starch aqueous solution and a silver nitrate solution are mixed uniformly, and a fibroin aqueous solution is added to obtain fibroin nano-silver colloid, and after being added with a protein aqueous solution, carrying out padding treatment on a cellulosic fiber or cellulosic fiber product subjected to selective oxidation treatment, so as to obtain the antibacterial cellulosic fiber or antibacterial cellulosic fiber product. According to the technical scheme, nano-silver is attached to the surface or the interior of the cellulosic fiber stably for a long time, and simultaneously the cellulosic fiber or cellulosic fiber product is endowed with the protein property, and has the characteristics of being long-acting in antibacterial function and good in washability.

The invention discloses a preparation method of a nano-silver alginate fiber. The preparation method comprises the following steps of: preparing an alginic acid silver complex which is a precursor of nano-silver by using algal polysaccharides and soluble silver salts, and then preparing a sodium alginate based nano-silver colloid system through a chemical reduction method; then adding fiber-grade sodium alginate into the sodium alginate based nano-silver colloid system to obtain a nano-silver algae spinning solution; and finally, obtaining a nano-silver algae primary fiber through wet spinning, and carrying out stretching, sizing, drying and oiling treatments to obtain the nano-silver alginate fiber. The prepared nano-silver alginate fiber integrates the excellent performances of the nano-silver and the alginate fiber, so that the novel fiber has excellent flame retardance, biocompatibility, moisture absorption permeability and the like, also has excellent antimicrobial performance, antistatic performance and irradiation resistance and can be widely used in medical treatment, the fire-fighting field, the military field, the aerospace field, the health textile field and the like.

The invention discloses a nanometer silver colloid solution and a preparation method thereof. The nanometer silver colloid solution is characterized in that the 100 ml of nanometer silver colloid solution comprises the following raw materials of 0.1 to 10 g of complexing agents, 0.1 to 2 g of reducing agents, 0 to 5 g of dispersing agents, 0 to 8 g of protective agents, PH (Potential Of Hydrogen) conditioning agents for performing conditioning on the PH value within the range of 4 to 10, 0.002 to 0.4 g of silver salts and the allowance purified water. The complexing agents, the reducing agents, the dispersing agents, the protective agents, the PH conditioning agents and the silver salts are dissolved in water according to the sequential order, the aging reaction is performed under a certain condition, and the nanometer silver colloid solution is obtained eventually. According to the preparation method, the severe reduction reaction is not required, the mild polyol weak reducing agents are utilized, the reaction rate is controlled by the complexing agents, and the nanometer silver colloid solution is obtained at the low temperature. According to the nanometer silver colloid solution which is prepared from the preparation method, the controllable range of the PH value is 4 to 10 and the nanometer silver colloid solution is colorless, transparent, discoloration-resistant, strong in stability and the like. The preparation method has the advantages of being simple in operation, wide in parameter adjustable range, low in energy consumption, short in cycle, suitable for mass production and the like.

The invention discloses an externally used nanometer silver antibiotic jel line products, which is characterized by the following: constituting with acceptable shaped agent, diluent, slow releasing agent, disperser on nanometer silver and medicinal; setting the grain size of the nanometer silver at 1-25nm; comprising push injecting agent, foam spray, aquagel cleaning solvent, spray and so on of nanometer silver antibiotic jel line products. This invention also relates to the preparing method of nanometer silver colloid and nanometer silver antibiotic jel line products. This product can be used to cure vaginitis, cervicitis, mixing infection type gynaecologic inflammation, prostatitis, prostate proliferation, prostatauxe, male urethritis, balanitis, posthitis and so on.

The invention provides a method for surface-enhanced Raman scattering spectrum detection by using a silver-surface molecularly imprinted polymer, and relates to the method for the surface-enhanced Raman scattering spectrum detection by using a molecularly imprinted polymer. The invention aims at solving intricate process and poor detection effect problems caused by poor combination between the molecularly imprinted polymer and a metal film in an existing method which needs to mix the molecularly imprinted polymer and other substances such as silver colloid or coat the molecularly imprinted polymer on other metal films such as a silver film. The method provided by the invention comprises the following steps of: I preparing silver particles of 500 nanometers to 5 microns; II, modifying the surface of the silver particles; III, preparing pre-assembled solution of target molecules and functional monomers; IV, preparing pre-polymerized solution of the molecularly imprinted polymer of the silver; V, preparing the particles of silver-core molecularly imprinted membrane shells; VI, preparing the silver-surface molecularly imprinted polymer; and VII, performing the Raman detection. The method provided by the invention is applied to the field such as clinical medicine analysis, quantitative analysis, trace analysis and single-molecule level.

The invention discloses a sea urchin-shaped hollow gold and silver alloy nano particle and a preparation method and application thereof. The method comprises the following steps: dissolving silver nitrate into water; heating the mixture of the silver nitrate and the water till boiling; adding trisodium citrate aqueous solution in the mixture and keeping boiling for 3-30 minutes to obtain a silver colloid; mixing chloroauric acid aqueous solution and the water; adding the silver colloid under the condition of agitation at the temperature of 15 DEG C; adding hemoporphyrin metalporphyrin aqueous solution and obtaining a reaction solution after 5 min reaction; performing centrifugalization of the reaction solution, washing deposit obtained via centrifugalization, and obtaining the sea urchin-shaped hollow gold and silver alloy nano particle. The diameter of the nano particle is 80 nm-300 nm, the hollow size is 20 nm-50 nm, the length of a stab is 10 nm-30 nm, the diameter of the stab is 10 nm. The preparation method is simple, low in cost, gentle in condition, short in time, easy in process control, and large in production capacity. The obtained nano particle can be well applied to organic molecule detection, earlier detection of tumour and photothermal treatment.

The invention relates to an epoxy conductive silver colloid used in LED, the raw material formula of which comprises the following components according to weight percentage content: 70 to 80 percent of silver powder, 8 to 15 percent of epoxy resin, 4 to 10 percent of toughening agent, 0.5 to 2 percent of curing agent, 0.05 to 0.3 percent of accelerator, 3 to 7 percent of solvent, and 0.1 to 2 percent of additive; the epoxy conductive silver colloid is prepared by (1) preparation pf substrate; (2) preparation of silver colloid; (3) production process of silver colloid. Compared with the prior art, the epoxy conductive silver colloid used in LED causes the curing condition of the conductive silver colloid and shear strength to be coordinated better, is more suitable for the industrialization production, and improves production efficiency and the reliability of products.

The invention belongs to the technical field of nano, in particular to an original ecology separation and redispersion method of a nano metallic colloid. By taking spherical nano silver as an example, the method comprises the following steps: stirring and reacting silver salts under the existence of an organic protective agent and a reducing agent to obtain a nano silver colloid; adjusting the pH value of the nano silver colloid with acid, and continuously stirring and reacting until the colloid solution gradually appears flocks to obtain nano silver particles; and dispersing the nano silver particles in an organic solvent, and dispersing by ultrasonic to obtain the nano silver colloid dispersed in an original ecology mode. The invention can realize original ecology separation and redispersion repeatedly based on the interactive relationship among a dispersing agent, nano particles and the solution. The invention has the advantages of simple process, mild operation condition, short reaction time, little changes in particle size and appearance after repeated separation and dispersion, low preparation cost and no generation of harmful waste, and conforms to the requirement of green production.

The invention discloses a method for preparing a thin-film LED, which belongs to the technical field of preparing semiconductor chips. The method comprises the steps of obtaining a wedge-shaped groove through laser scribing on an epitaxial layer; utilizing reactive ion etching to obtain a P-type trapezoidal mesa with an oblique side; preparing a p-type ohmic contact and a reflecting electrode on the trapezoidal mesa; preparing an insulation-passivation layer on the rest part except the electrode of the trapezoidal mesa; uniformly coating the whole LED epitaxial layer and a substrate with an appropriate amount of conductive silver colloid with high thermal conductivity as well as matched expansion coefficient and elastic modulus; subjecting a sapphire substrate to laser peeling after high-temperature bonding; cleaning a surface; forming an n electrode on the surface; roughening a light-outlet surface except the electrode; thinning the substrate to a needed thickness; preparing an ohmic contact and an eutectic weld pad on the back of the substrate; performing laser scribing and cracking and obtaining a thin-film LED chip. The method has the advantages of reducing chip rupture brought by laser peeling, increasing the outgoing of ambient light of the chip, increasing bonding strength and improving the light-emitting efficiency and reliability of the chip.

The invention discloses a production process of electroconductive glass fiber. The technical scheme is realized in such a way: the electroconductive glass fiber is composed of the components in percentage by weight: 95-70% of matrix glass and 5-30% of nano-silver. The production process of the electroconductive glass fiber comprises the steps of melting raw materials for producing the matrix glass; drawing to form a glass fiber filament; immersing the glass fiber filament to a nano-silver colloid solution for 15-20S, and airing by using hot air with the temperature of 70 DEG C after the surface of the glass fiber is sufficiently coated by a nano-silver colloid to initially prepare the electroconductive glass fiber; and placing the electroconductive glass fiber into deionized water to soak for 40-60S, and drying to obtain a finished product of the glass fiber with strong conductivity. The production process has the following beneficial effects that the production cost in the embodiment is relatively low, and the nano-silver colloid is simple in preparation and easy to operate; and the conductivity of silver is best in all metals, so that the glass fiber can take effects in more fields.

The invention relates to a method for preparing antibacterial non-woven fabrics based on a nano-silver monoatomic antibacterial agent, which comprises the following steps: taking a nano-silver colloid (patent number: ZL 200910091031.1), and drying and crushing the nano-silver colloid so as to obtain nano-silver monoatomic powder; then, mixing non-woven fabric spinning resin, the nano-silver monoatomic powder, a coupling/dispersing agent and a discoloration inhibitor, then carrying out granulation on the obtained mixture so as to obtain antibacterial agglomerates; and finally, carrying out conventional spinning on the antibacterial agglomerates so as to obtain an antibacterial non-woven fabric. According to the invention, the antibacterial agglomerate is good in spinnability in the process of producing non-woven fabrics, and compared with other types of antibacterial agglomerates, a screen replacing period and a spinning assembly replacing period are relatively long. An antibacterial non-woven fabric obtained by using the method disclosed by the invention, besides having all properties of common non-woven fabrics, has a good antibacterial effect and is high in hygiene and safety.

The invention provides an active carbon filter screen and a preparation method thereof. The active carbon filter screen comprises the following components in parts by weight: 80-100 parts of active carbon, 20-40 parts of sepiolite, 10-30 parts of aluminum oxide powder, 0.2-2 parts of nano silver colloid and 5-15 parts of a formaldehyde capturing agent. The components of the active carbon filter screen are toxin-free and environmentally friendly so that the active carbon filter screen can be applied to an efficient air filter, can be used for efficiently removing formaldehyde and has a wide applicable range.